The Double Face of Base Excision Repair: Preventing and Triggering Double-Strand Breaks

Area of Science:

• Molecular Biology
• Genetics
• Cellular Biology

Background:

• Oxidative damage to DNA is a constant cellular threat.
• The base excision repair (BER) pathway is the primary mechanism for repairing oxidized DNA bases.
• The role of BER in maintaining genomic stability is complex and context-dependent.

Purpose of the Study:

• To review recent findings on the dual role of BER in DNA repair and genome instability.
• To explore how BER pathway choice and chromatin remodelers influence DNA damage outcomes.
• To understand the link between aberrant BER and oncogenesis.

Main Methods:

• Literature review of recent studies on BER.
• Analysis of experimental data linking BER to DNA double-strand breaks and chromosomal fragmentation.
• Discussion of factors modulating BER pathway activity and outcomes.

Main Results:

• BER machinery can inadvertently generate DNA double-strand breaks.
• Aberrant BER activity contributes to chromosomal fragmentation and genomic rearrangements.
• Specific BER pathways and chromatin remodelers dictate whether BER suppresses or promotes DNA damage.

Conclusions:

• BER plays a critical, albeit complex, role in genome maintenance.
• Dysregulation of BER can lead to genomic instability and cancer development.
• Further research into BER regulation is crucial for understanding oncogenesis.